1.

For photoelectronic effect in sodium, the figure shows the plot of cut-off voltage versus frequency of incident radiation. Calculate work function for sodium.

Answer»

SOLUTION :WORK function, `W = hv_(0)`
`= 6.6 xxx 10^(-34) xx 4.5 xx 10^(14) `JOULE
`= ( 6.6 xx 10^(-34) xx 4.5 xx 10^(14))/( 1.6 xx 10^(-19)) EV`
`= 1.85 eV`


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